Grate.



No. 778,749. PATENTED DEC, 27, 1904. A. E. JOHNSON.

GRATE.

APPLICATION FILED AUG. 29,1903.

4 SHEETS-SHEET l yywk clam e13 PATENTED DEC. 27, 1904.

A. E. JOHNSON. GRATE.

APPLICATION FILED AUG. 29.1903.

4 SHBETSSHEET 2v 0 0! woo-14 1 oz N0. 778.749. PATENTBD DEC. 2'7, 1904:.A. E. JOHNSON.

GRATE.

APPLICATION FILED AUG. 29,1903.

4 SHEETS-SHEET 3.

LL n FL/I'L n J No.77&749.' PATENTED-DEO.27,190&

A.E.JOHNSON.

GRATB.

AYPLIGATION FILED AUG. 29.1903.

4 SHEETS-SHEBT 4.

UNTTnn STATES Patented December 27, 1904.

PATENT FFICE.

GRATE.

SPECIFICATION forming part of Letters Patent No. 778,749, dated December27, 1904.

Application filed August 29,1903. Serial No. 171,306.

To all whrmt it may concern:

Be it known that I, ALFRED E. J oHNsoN. a citizen of the United Statesof America, residing at Colorado Springs, in the county of El Paso andState of Colorado, have invented certain new and useful Improvements inGrates; and I do declare the following to be a full, clear, and exactdescription of the invention, such as will enable others skilled in theart to which it appertains to make and use the same, reference being hadto the accompanyingdrawings, and to the figures of reference markedthereon,which form a part of this specification.

My invention relates to improvements in grate constructions forgas-producers and furnaces, and the invention will be described andshown herein as applied to a gas-producing apparatus, though it must beunderstood that my improved construction is equally applicable tofurnaces in general.

The invention will now be described in detail, reference being made tothe accompanying drawings, in which is illustrated an embodimentthereof.

In the drawings, Figure 1 is a front view of a gas-producer equippedwith my improvements. Fig. 2 is a central longitudinal section of thesame, showing the gas-producer in connection with a roasting-furnace.Fig. 3 is a section taken on the line 3 3, Fig. 2. Fig. 1 is a sectionalview of the grate, shown on a larger scale. Fig. 5 shows a singlegrate-bar in cross-section on the line 5 5, Fig.6. Fig. 6 is a top viewof a grate-bar with portions broken away to better illustrate itsconstruction. Fig. 7 is a front view in detail, showing the outerbearing for the grate-bars. This view is on a smaller scale than in Fig.4:. Fig. 8 is a detail view of the lower part of one of the grate-barbearing-plates shown in Fig. 7. Fig. 9 is a fragmentary detail view ofthe rear supporting plate or block in which the gratebars are journaled.Fig. 10 is a top or plan view of the water-trough, shown in detail.

The same reference characters indicate the same parts in all the views.

Let the numeral 5 designate the fire-box, and 6 the ashpit, of agas-producer. This fire-box, as shown in Fig. 2, communicates by way ofa flue 7 with a roasting-furnace 8.

The fire-box is provided with a door 10. This fire-box door is hinged atthe top, as shown at 12, and locked on opposite sides by latches 13,pivoted at 14:, whereby they are adapted to swing upwardly to theunlocked position.

The bars 16 of my improved grate are independently mounted and adaptedto be shaken or rotated separately. Each grate-bar 16 is composed of atubular or hollow part or bar 16 and a cast portion 16, secured to thepart 16 by stud-bolts 16, which are threaded in the part 16*. The castportion of the bar is composed of a number of segments which arecentrally recessed to fit the hollow part and are applied to the side ofthe latter which is normally lowermost. These segments 16 projectequally on opposite sides of the hollow or body portion of the bar,these laterallyprojecting parts being slotted, as shown at 16*. Theremay be any desired number of castiron sections or segments 16, or thisportion of the bar may be cast in a single piece, if preferred. The rearextremity of each hollow bar is closed by a screw-plug 17. This end ofthe bar is journaled in a back hearing plate or block 18, having abearing 18, which the rear extremity of the bar engages. This bearing isopen at the rear, as shown at 18 to allow any foreign matter orsubstance that may accumulate therein to escape into the ash-pit belowby way of a passage 18. The forward extremity of this grate-bar isclosed by a stuffing-box 19. This end of the bar is entered by awater-supply pipe 20, which passes through the gland 19 of thestuffing-box. Each grate-bar is so connected with the water-pipe thatthe bar may be turned on the pipe whenever it becomes necessary to shakethe grate. The shaking operation of each bar is accomplished by means ofa leverarm 21, pivotally connected, as shown at 22, to a collar 19, madefast to the hollow bar by a stud-bolt 28. Each arm 21 is adapted toswing outwardly on its pivot 22 sufficiently to release the arm fromengagement with a locking-recess 24:, formed in a forwardly-projectingflange 25, with which the lower part of the water-trough 26 is provided.The waterof the hollow bar 16.

each water-pipe 20 is open to allow the water to enter the bar and passforwardly therethrough around the pipe 20 to outlet-pipes 27, locatedforward of the fire-box. These pipes 27 discharge downwardly into thetrough 26 for carrying away the water. This trough is arrangedunderneath the discharge-pipes 27 of all the grate-bars. (See Fig. 1.)The waterpipes 20 are all connected with a main supply-pipe 28,connected with a pressure source (not shown) by branch pipes 29, wherebythere is a continuous flow of water under pressure through thegrate-bars when the furnace is in use. The grate-bars are furthersupported and journaled in the front bearing-plate 30 and removableauxiliary plates 30. The plate 30 extends across the front end of thefire-box and forms a support for the wall above. There is an opening 40in the front wall of the apparatus, and the plate 30 is located in thisopening. The plate 30 is provided with openings 30, which are normallyclosed by the removable plates 30. The bearings for the gratebars areformed half in the plate 30, as shown at 30, and half in the auxiliaryplates 30. as shown at 30. The plates 30 are held in place by metalstraps 32, which extend vertically across the plates 30, theirextremities being bolted to the plate 30 at the top and bottom that isto say, above and below the openings 30. When it is desired to removethe gratebars or any of them, the plate 30 forming a part of the bearingfor the bar or bars to be removed, is detached, after which the bar orbars are drawn out through the opening 30. The walls of the fire-box areprovided with a front opening 33 below the grate for the introduction ofan air-blast from a pipe 3 The fire-box is also provided with openings35, on opposite sides, located above the grate, for the introduction ofan air-blast from a pipe 36.

From the foregoing description the use and operation of my improvedfire-box will be readily understood. The fuel, such as coal, from whichthe gas is to be generated or from which heat is to be produced, as maybe desired, is placed within the fire-box through the door 9 and restsupon the grate. The necessary air is introduced below the grate by wayof a blast-pipe 34 and above the grate by way of blast-pipes 36, the airpassing through the branches 37 and entering the firebox above the grateby way of openings 35. The valves 29 are opened to supply the necessarywater to the grate-bars. The water circulates through these bars, beingcontinually in motion, entering by way of the pipes 20 and dischargingby way of the outlet-pipes 27 into the trough 26. Whenever it isnecessary to shake the grate-bars for the purpose of clearing the grateor for any other reason, the lever-arms 21 are moved outwardlysufficiently to release them from the locking-recesses 24E of the part25. The lever-arms may then be moved back and forth in succession,whereby the grate-bars are independently given partial rotations inreverse directions. After this is accomplished the lever-arms are againreturned to their locking position.

An important advantage in having individual outlets 27 for the hollowgrate-bars is that it enables the person in charge of the furnace toknow at all times the condition of the fire upon the grate by observingthe water as it passes from the pipe 27 into the trough. The temperatureof the water indicates the fire on the grate, and if the temperaturevaries the grate-bars from which the cooler water comes may be shaken inorder to clear the grate of ashes and bring the fire in direct contactwith the bars. Hence the individual discharge from the grate-bars aidsthe operator in controlling the furnace and enables him to keep an evenfire upon the grate.

Having thus described my invention, what I claim is 1. A grate composedof hollow bars adapted as a whole to be cooled by the circulation ofwater therethrough and having parts detachably connected with the bodyof the bars and located wholly below the upper surface of the bars, thesaid parts being provided with laterally-extendingfuel-supportingfingers, the lower portions of said parts being protectedfrom the heat by the hollow portions of the bars.

2. A fire-box grate composed of hollow rotary water-cooled bars providedwith individual open-ended exposed outlets, suitable means for supplyingwater to the said bars, and means for shaking the said barsindependently of each other.

3. Afire-box grate composed of hollow rotary water-cooled bars,fluid-pipes entering said bars and extending toward their rearextremities a suitable distance, the size of the pipes being such as toleave a space within the bars and around the pipes for the circulationof the water, exposed individual openended outlets connected with thebars, and means for shaking the said bars independently of each other.

4. A fire-box grate composed of hollow rotary water-cooled bars whoserear extremities are closed, fluid-pipes entering the forwardextremities of the bars, a stuffing-box and gland connection between thepipes and the bars whereby the forward extremities of the latter areclosed, the said pipes extending toward the rear extremities of the barsa suitable distance and their rear extremities being open to allow thefluid to pass freely into the hollow bars and flow forwardly throughsaid bars around the pipes,and exposed, individual, open-ended outletsconnected with the forward portions of the bars, means for introducingwater to the pipes entering the hollow bars, and means for shaking thesaid bars independently of each other.

5. A hollow grate-bar having an exteriorlylocated portion detachablyconnected therewith, said portion lying wholly below the upper surfaceof the hollow bar and provided with laterally-extending fingers, thelower part of the said portion being protected from the heat by thehollow portion of the bar.

6. A hollow water-cooled grate-bar having a portion detachably connectedwith the body of the bar, located wholly below the upper surface of thehollow portion of the bar and provided with fingers extending laterallyin opposite directions, the said detachable portion being protected fromthe heat by the hollow water-cooled portion of the bar.

7. A hollow water-cooled grate-bar provided with a portion detachablyconnected therewith and located wholly below the upper surface of thebar, the said portion being provided with laterally-extending fingers,and suitable means for introducing water to the hollow bar.

8. A hollow water-cooled grate-bar proyided with a portion composed of aplurality of sections detachably connected with the bar and locatedwholly below the upper surface of the latter, the said sections beingprovided with laterally-extending fingers.

9. In a fire-box, the combination of hollow water-cooled grate-barshaving parts lying wholly below the upper surface of the bars, saidparts being provided with laterally-extending fingers and beingprotected from the heat by the hollow portions of the bars, front andrear bearing plates or boxes in which the bars are journaled, anddepending leverarms hinged to the respective bars whereby they may bemoved from the locked to the unlocked position, and a part connectedwith the front of the lire-box and provided with locking-recesses toreceive the respective lever-arms which are normally maintained in thelocked position by gravity.

10. In a grate construction, the combination of hollow rotary bars,pipes entering the forward extremities of the bars, the said pipes beingcarried rearwardly to a point near the rear extremities of the hollowbars, the rear extremities of the water-pipes being open, the forwardextremities of the hollow bars being provided with individual open-endedexposed outlets, means for supplying water to the pipes entering saidbars, and means for shaking the said bars independently of each other.

11. In a grate construction, the combination of hollow, rotary,water-cooled bars, provided with individual, open-ended, exposed outletswhose highest parts are located above the highest portions of the hollowbars of the grate, thus insuring that the bars remain full at all timeswhen connected with the watersupply, suitable means for supplying waterto the said bars, and means for shaking the bars independently of oneanother.

12. The combination in a fire-box, of hollow rotary water-cooledgrate-bars, individual open-ended exposed outlets connected with thebars, a trough adapted to receive the discharge from all of saidoutlets, and suitable means for supplying the bars with water, and meansfor shaking the said bars independently of each other.

13. In a fire-box, the combination of a suitable grate composed ofhollow rotary watercooled bars provided with individual, exposed,open-ended outlets, and means for shaking the bars independently of eachother.

14. The combination in a fire-box, of hollow rotary water-cooledgrate-bars, means for supplying the bars with water, individual,open-ended, exposed outlets with which the said bars are provided, andlevers for separately operating the grate-bars.

15. In a grate construction, the combination of hollow rotary bars,water-tubes entering the forward extremities of the bars which areprovided with stufiing-boxes and glands through which the water-tubespass, the said tubes extending near the rear extremities of thegrate-bars and having their extremities open to discharge into thegrate-bars around the tubes, means for introducing water to the tubesunder pressure, individual open-ended exposed outlets connected with thehollow bars, and means for shaking the said bars independently of oneanother.

16. In a grate construction, the combination of hollow bars circular incross-section and adapted to be cooled by the circulation of watertherethrough, and having parts connected with their lower sides, saidparts lying wholly below the top surface of the bars and being formed tofit their under sides and constructed to project laterally therefrom toform a fuelsupport through which the air for combustion may pass, thelower portions of said parts being protected from the heat by the hollowportions of the bars, and suitable fastening devices having a threadedconnection with the bottoms of the grate-bars, their exposed extremitiesbeing located underneath the latter.

17. In a furnace, the combination of afirebox having an opening in itsfront wall below the plane of the grate-bars, and separated from thefire of the furnace, hollow gratebars, means for introducing waterthereto, a waste-water trough located in said opening in the front wallof the fire-box, individual openended, exposed outlets connected withthe forward extremities of the bars for discharging the waste water intothe said trough, and individual levers connected with the grate-bars,the waste-water trough having a forwardlyprojecting notched flangeadapted to receive the grate-bar levers when in their locking position,the said levers being pivoted to swing forwardly out of the said notcheswhen it is desired to shake'the grate-bars.

18. In a grate construction, the combination of hollow, rotary,water-cooled bars, pipes IIO entering the forward extremities of thebars and connected to introduce water to the latter under pressure,individual openended, exposed outlets connected with the forwardextremities of the bars, an open trough located beneath said outlets,and means for shaking the said bars independently of each other.

19. In a grate construction, the combination of hollow revolublegrate-bars, means for introducing water thereto at the forwardextremities of the bars, the latter being provided withforwardly-located outlets, an open water-trough located beneath theoutlets to receive the waste Water, the said trough havingaforwardly-extending notched flange, and levers pivotally connected withthe individual grate-bars and normally engaging the notched flange ofthe trough whereby the bars are locked against lateral movement.

ALFRED E. JOHNSON.

\Vitnesses:

H. V. HoLMAN, CHARLES V. TURNER.

